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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14cdc89fd11f0f80134d0a005471c88f8a8f7b1af66ebff0e5b416ba30ccf859' 
  AND token = 'fyWLUGNiNDNc16Pe+Btb9XmSif8mRjKWkoo4m/s8WVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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