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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c592b445c98fd25fc660685de23cccea380832fb32b9a57418868fca7fcfd64' 
  AND token = 'kgNr75RdWHfTBkM46OBO508q8j4ZQIKqao8ao2M//iI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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