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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a3e3414dbfbf9de9f089af4922283b8de1e0880f3b0b3c44adb2f695c6fb5d6' 
  AND token = '9Fu3r6h0IQ2bVZAL0HNZChxqcsYl0tvm8sYgU56Of5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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