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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '699847919ca9c9833ab043e9185fb10f82deb57236ede47b78bb7b696648b794' 
  AND token = 'ovIsXFLMH0p5JJRmTykuvFs2ZMcprbJlKH4+Yedr/ZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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