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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49ca0675d5dc5435dfe887366c8dea83854c438d64cb66f66f305ef134c1d503' 
  AND token = 'cSu1xna2O4ITzupmL7NkrmP1FyzHr6R0dZySOw+YfiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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