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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8163c8b605506529c49fbb5c83ea36d0c4df3ae2c215137b34f367ab171b79c7' 
  AND token = 'jixI14O4Dv81QrdpU5pIwFLIBGTtWVCRNIAnjxcdjk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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