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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be1440b9b5edfe95acabdc83ebfc35c0c6c17aa22ac2962e98d680371bd3f24e' 
  AND token = 'gcmae4Sj9H63PM0FEx/GbX9GRJu5pWVuc5SbX0/ckXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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