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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19167a94300d20e2e73dff4b5d3a5ffb465d932c83f852f268f32c614ddd5369' 
  AND token = 'c7ZiBBW9SCbrWndw9qX5ANKGKgOR9sp99ELeP0vLU24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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