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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c542886804a93360470b5a3ff1a365c304bc951fc36f454d6fbbfeb61a9ff96f' 
  AND token = 'q7Mo1hBViJ+EggyvFR+0WyeeEeoZIB3urVrlc51gfNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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