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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8802ba6c5688a0512856d9d0ee1021876cd5ab9831811fcb3832df0773de46a2' 
  AND token = '9lhv1i5i4piQiZFRSh3bm7iNlYZIstfCQiBMb3cFSgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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