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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd94ec569bbbe3f99793d533601df548c0f2ee3723487f1dc3423be1601920ce4' 
  AND token = 'NDmv7NyO31twiN8EENVNvkc46g97ZblsC4P26vAaaEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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