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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e131b49f533217a0b42b41c95ca105dbfd425694fb36171b9ac49f2cf9f069a' 
  AND token = 'z592/rxKHQp1+bjfhe0lW0uWeSj2JJAAVWF01us9bu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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