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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4ea57b90559040a70f9ad6cd6d962c405f7cdf6c6ca78428b22425bf2b11ae3' 
  AND token = 'T3xXcXHyA/zbXHS5aOTRBdoNll10/pzMToy8s+Z5OVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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