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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6933e9218d4a24a7c6335ad9b013fcf72ec5be9e4d3e1ee33ccc1f63a594a689' 
  AND token = 'nTzsrmNapRXcYJn6U8Bob6UPiBdOsxQawlwXGUQfmVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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