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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0babbc5c633949912b2151a3cea4626fb8ef5caf9f06e8775957a59020aebf97' 
  AND token = 'gv4a3l8bkLbdo5BIAR1DoiHEMiMzaOBW99uo+tGMENg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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