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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9472acd0f858c65ba2a6d131ab7697b31082c2f90ebf0ac84827d19266165eb' 
  AND token = 'ODNAOf1AjF45qpU2BIEvxJ8ZalfieCRi6DGVQCHpcrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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