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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '204ddc7bcc17e9aab1ec449efd47057abb6516f79f2266626f4b1f1673af9fc7' 
  AND token = '/p/e/KwmllujvarmAPSogLmeC8WrL7g7GBd9rPixo7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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