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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7534f0b86f405c48fa1f7a3cec39e66ef75f8642d62763e97a97e312c114148f' 
  AND token = 'fmAb4MYtxmexvorprkoFGhbOuMhJ8NeK4kCCIJwBhv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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