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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '944272d6cbd6aac0ea019a517578d44ad7118f39024d81e284cdd9ec1663248a' 
  AND token = 'LS3S9vHb2qQ0D7n6WCJv+E4chYcvvC9EviOX7jz5wYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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