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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '301cb54e81872eb0ce2b6d19f617e24519ca97acaab33ad802767435eb7c17a4' 
  AND token = 'sek3HMypmugSPZ4RpYu3Yd0iiaXIQNUfetKraSX1Xlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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