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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2259c4d345e3e707fc0cce3d41ea98ae5d1fd34373dd68ea57c390f94a1ff572' 
  AND token = 'iivsuw47Xc1gJ7y3l3QaYKx+H/JWQ1AYBhXx+Plnwd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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