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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5b8daf7e69c5bf340b4dbee26f5149333aaa9537030e58e8cefc6fdaaf1f888' 
  AND token = 'g3/ODtuiVS9sENiQzhMnOzUsd5dAczjsZsEsL+5toSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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