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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '316fd2b71e050818f9a129efa44055ea35ccbddd9a22e11c9d4aceeed88d068f' 
  AND token = 'RlcyNJpu2hW5TZoEa2192VXYdZFFjuHgJep3Gt7xlQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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