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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aa3ee19bc5993a393b8bd44cf9b04349f3fb377d46f393a0ad6de4891aff913' 
  AND token = 'mMttkR5/rz/DIBRnoxYbkTvkdu8kUO7Iq8wQd0xN21U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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