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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5edf683a5f023de0cc845d5cd999d4dfabf5ae5c322ebf5f8387821eb949320c' 
  AND token = 'HCbkvgQQHHicoVr8OlXRAeWlTJFxguSGDVftW+aZSPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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