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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b91440a5793623d8a1dc2ac2d27120abc22d9e48c0b2da8674036e538e9249e' 
  AND token = '4h797t4fjNvw6OH83coQvs3wI2QyWavFZOAVB4HR1M0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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