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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2aa9bd12295704ac10bf846ec7da9dafd2c83da36f2d87f6a5946ccad49e38ce' 
  AND token = 'Qx0y87AtWAKRnkdNuM6uHPW5ukWfvJTsltciOyC4ojk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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