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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62ea8b0bc6ba5809ce9a45b1cc15a101ae115e48d6bcaf25a1c85b9b7147bde3' 
  AND token = '52TPDMR+bGcnRSbyHmf3/j8fJOVC/zi8n9JkaX+JdrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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