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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c2847cf9c733fd5935db1a02022c648158224c894d8b7d1cc421ded1191536d' 
  AND token = 'ytdCzblZkfMg287lI5pNGTkm2qSt8ksaohoDxHEfoTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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