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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52b9906ceb2e6b40f1db848b8969be45e7f32e39dac8a35082870638ba56fd19' 
  AND token = 'Ls44acAxChfUdjeTQqEfYEZl1WG/OxSn3+yyecUA+mU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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