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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0592f8b84e8c97c72154209c038e805a153b5b4d8a619e2c8ad3f36bb2f3a372' 
  AND token = '5laXvlkIwel6kvWBxQl5iofQN+LHcduoaFAEEPrR/Yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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