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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2156d84f4e3e246d31593ca9f589f20918cd92b946a089e7612bf955e3ad8d26' 
  AND token = 'UJKMmjwDEodLceBeK6hj/NkzC1J5rAArz1vk+t8FlaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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