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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '207b0f370a2bc17af6d51080abb8fd34ba92e370a5ce35b545a73d4fe4f4ef85' 
  AND token = '/gfSHLstxBVaYB67NqEajeIaHU12FMwOUMvY+ZrMklg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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