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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '570a1301e2d0613153267c494f93957469d5d114a38edaedf4145af7cc5a3eb0' 
  AND token = '+ZUEA5bJ8ivT6Aulfp5J4IyZPU6IyD35cH32N7Es72s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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