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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd42f3ce3ec7630c6804bbc71c72c3c83f44f34e7891bea8ae1ee676046285af1' 
  AND token = '8b19PKkL/yOfEsqGwg2hQgfI1vZEMNkSX8PrbvG8yiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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