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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f85d2d7db45a5555cfab815e52ef3087fc05ae31c4256032f926c2d95b69f79f' 
  AND token = 'bT+N8rJprWbgYNBQGZiq558NoOeUh0EA1ZM0C3nV2lY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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