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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce3dc7194a441d212578972722b690e31d5354c39c8df9e979faa7ffaedb48a2' 
  AND token = '+u2isSTG15XiL5wRbCTm60Hz6wwa6ZiEzIIO27GAvu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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