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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea9e970c6e6dfe0e1d1fd75246f13b7ffbe55a2f740e1e225d789b682948ec36' 
  AND token = 'tte6nfYPf6juFUgiUngm6p8CSUJmxiUYCMXz6S5Mq3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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