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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '808194b6d25b1d4d7feedc04460472b67bf3fcc2cbe401f8226c7d36c465e4e4' 
  AND token = '+brz2snbC3SJwp2RYydED9MmKM/Yws5bhSLd/s80wBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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