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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6c4c1e1a67227e1fc9acb4961bb1cc6af7ac1bbf121300f409dc86f572bcba0' 
  AND token = 'yr6sPuKCLdFEfnuCRfky7wmBidci7gvK/w2B+Iq1ahA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}