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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcd6fcc2ca45b119e5450de61f8154921749cd1927e20dc7d50a08b05d10e9b3' 
  AND token = 'EE/1ZOkHzJTeMHYCv00RqlHX4fh5w3uglfoRjpo8PsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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