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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c552a1a6a42e00de16df56f2ec1b95f8068b50a71c5a83d18abc029d9bc3d40' 
  AND token = 'Rv+O2aP3ZHjeJVCyEyuZ8aKdQBcFXnIGD3bQELSaoXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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