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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67c6b52ce91ee7971c034b1b75e42f81101fe09045d1bbe3a54a7b6c92d37d6d' 
  AND token = 'IHxvV8FLdbuORvdMPpauTZa7rknmtoXpQ6Gxv8BNavo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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