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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faebb4a518ef3441004b9cfc29fbdf2939d87ea3ae82a35cac3557d35308418e' 
  AND token = 'HSX7Dtj4FIauf3t5zxYY33X72s6Zo9v/1PsrZn6Tffk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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