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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd42bd54460064fcc48dfdb8988c3b7b8ee8839b4133213768220be57c2c864c8' 
  AND token = 'TMK5CtdCYgaP6tO5OyBZYOFGiY1stJG29xGJPnAiI3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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