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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8bde375c955458272085b1733b8e26aa634949032c9a042bbd722365bc1cccf' 
  AND token = '71tye5xP3jsPe7PgB9voHIy9s4hcYT5C1ed2oD1nh90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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