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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1410e8f9d10922b2d07e40c9950c9c81d4fc506089eb1440619ebe29d3c36cd3' 
  AND token = '3U0P5YEty3xXOD0AVNBmaxuUpi8fHFdGToNlXOOZdJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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