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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '629f279d19bad54bb265580fc7a870e3b4782be21d6f83631acb3aa0f84d22f3' 
  AND token = 'Oj1tMbn2nH6hhUdfyTV2L0MN9MSwhXPCX5EVd2reJPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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