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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca79c531dcd1d21ed0cc43601d57b035c4da7bb1e8540f787cc93651b0343058' 
  AND token = 'fV+zgMKOnb+wkanWj6Tew8KI8fyr7c6VFoaggEy6bkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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