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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31adea7884dafa45b83f86df786c8bef474ec67ebb5cb5cd0808c5f3f9debe50' 
  AND token = 'vMw3jqrxZzWaPKIN1hIa//sAUxvO3L61DGd/mm08pVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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