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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05f556bc3ae9d7f7153069b26722c3fd0ffc780b05e56ddb0fa256952e7ccc61' 
  AND token = 'w9YFinl03SGj7robnbBarecGlCrzaExNLyGS4VkVMO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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