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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b684fd2c58c1cd36e0c9155339b30d741e12267ecbe723aa65622e3d3b96e148' 
  AND token = 'RiWzNWDu7l8cMBFd3vXwr85MzMbVVqgOoXtIGRVoj8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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