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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80b676d7011846987016ec087415552bf7a2a6faa67c9f9caf25f547d4e5bd1d' 
  AND token = '/XCQ+wrHO7C2GcguNHLl19qWSp/zXktoc8nXhoGrxDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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