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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '968958a788c2e2226f6883686d7b5f94d9d2e0a01f8e9b040cf19e065a6c55d6' 
  AND token = 'B+Jmg+K+1bnfxN4tJf8gK7vR6Wrho4xPb7uXuyISkDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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