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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fcdc255e72560e830d64b9d8552458a36bd1924da09400a5254c8de9bfcab14' 
  AND token = 'CAcRJ9ElGUpQ3UppnG+CEnagV0+H5TeznC+9en1i6qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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