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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c953a9aae20ef8aa70da71b8b399efa6495a1a8ddde0f3d11ea7d7eddb1b221' 
  AND token = '/ToLpRSZKWvI8M53cX6Jtwygm8hPeZGbt0UsxumXaCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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