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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee5562652a879c04cab9987d6b2b09c6bd041ae347185d720fc9852ab085e045' 
  AND token = 'JMVhl5VO08gVrQVx3JQ08Jdd3A4TxuOLFEMe6f3smXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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