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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84bdf827759e98fbeb543bc552c546770efbb95c40b0ddc4adf21e76607f649f' 
  AND token = 'oRu+lZ0Wsrcd1ciGmsKHg+KHB1N2Nxqy129b3hc1Jes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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