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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60b22fadd8a6615b6cc5f20fc9fc01fc7751e252137156e45f90300510de2a90' 
  AND token = '2hH+OcqPLDXha86Ce6pqr/ogu1aEtRzoNX9AMKoWlJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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