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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4316601ada2ecc6c88da096c6ad5fd520764f7fa583a8dc98988774990210a9d' 
  AND token = '2+DJZ0DHQU/toifxoUA5/Di98c+fpxHq714BUYx/hVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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