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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c652e97721a788894087d2546650f9c63f82731aba470894fe1205c980253e1d' 
  AND token = '9zt+J1oj6hMZtBjwB51wlV08VEO63IIu3ry0awWniBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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