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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eab4f983a6a331639da14dd818357a5951e4e118ae78760746e3c42b7de02dbb' 
  AND token = 'vD6XVq9DnsRWEiTg+GO4ZYbrtkIK2+3gl0pa+w+B4gY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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