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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b3b020c778483b70a6e48c934910a5e01b0d48b4f7fd059517ac4ecd32351ca' 
  AND token = '24J8evvq3vVtCvVU6GedLk3IZ7oisfok1FAO8BZ3MLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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