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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8d64968918ebd508567a471e35ca0774266d65329d8c16b78b2a2ffd1b6c94f' 
  AND token = 'TC39+aVFYNHOQNtCD+61r4cbGNXuvX98TLp3F9v1v5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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