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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bd15a75822fe6eb569832262c82d7c444d75ed54c2997f95a59401367248a8b' 
  AND token = '4W6K4vKDi34sJFjgOtGNIstAFsdEX3r4p56eNOrYMUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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