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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '460ab9442a9e81f65e1635ffe5ed957dba73360a9f5523f379b0159ec2ee2364' 
  AND token = 'gZ0BR6M5EKQ18LEUi08w0o43la4CugTgtj9Vjh1vtCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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