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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a79e73477155b8a723a5dace0fe5704612db8106e87589843c00f9132d579120' 
  AND token = 'jvMfkiDz+BPDcHmOPdV8CVjfl65UciKIbPR+H3sEvxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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