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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28ee39f78ac3ed20dd86566f63ff0bdb0ca891b3b8090ea8345df8f2bb9566f0' 
  AND token = 'p0UewsJxXGxKCloPW5JnbJmsEgV2eMFafoJefwxGd3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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