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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fc8418eceaa2b91b7a3b39c0b20f8de5679073308c5805a01e45529060b895f' 
  AND token = 'KGk5aql8RMOSiz7V6MQfTtVuFTlc6xyc0iafa3i8Gw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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