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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67cba7a5fe06fb93c515b2033667dabe0943b8e75eb6e134f16c84f487a38524' 
  AND token = 'ROnR72CRGdejCn6F7qyl3Qo3BauMp2590ptgHSbXimc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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